Neil deGrasse Tyson on aliens. [VIDEO]

Neil DeGrasse Tyson On Aliens.

Jul 19, 2013 Interesting 207814
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Neil deGrasse Tyson is an American astrophysicists and the charismatic host of "StarTalk Radio". In this interview with Business Insider, Tyson discusses aliens, and why he believes humans have not interacted with them yet.

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